One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(6,8)(25,26,31,35)(27,36,38,32)(28,33,39,30)(29,40,37,34)(3,7)(6,8)(9,10)(11,17)(12,20)(13,14)(15,18)(16,21)(19,23)(22,24)(25,27)(26,32)(28,37)(29,39)(30,34)(31,38)(33,40)(35,36) involution — undirected(1,2)(3,6)(4,5)(7,8)(10,14)(11,18)(12,21)(23,24)(25,28,31,39)(26,33,35,30)(27,37,38,29)(32,40,36,34)(9,11)(10,15)(12,22)(13,18)(14,17)(16,24)(19,21)(20,23)(25,29,31,37)(26,34,35,40)(27,28,38,39)(30,32,33,36)(1,3,4,7)(2,6,5,8)(9,12)(10,16)(11,19)(13,21)(14,20)(15,23)(17,24)(18,22)(25,28)(26,33)(27,29)(30,35)(31,39)(32,34)(36,40)(37,38)(1,2)(3,6)(4,5)(7,8)(9,10)(11,15)(12,16)(13,14)(17,18)(19,23)(20,21)(22,24)(25,30,31,33)(26,28,35,39)(27,34,38,40)(29,32,37,36)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.